Opera will prompt whether 'wego.here.com' is allowed to get your location. Click on 'yes'.
Then nothing appens, even no error message. The same with other websites, e.g. Google maps.
Other browsers (Firefox, Brave) find the location on these sites.

I tried it again, but to no avail.
I set Location to both 'High accuracy' and 'Device only', but in both cases it did not work with Opera on more sites. When I tried the same with Brave, it worked flawlessly.
And I have granted Opera access to location services.
So there should be another thing which I have not enabled in Opera.
I have enabled 'Desktop site' to prevent some websites showing limited WAP pages and disabled Data saver.